18″ / 462 mm
Nominal diameter
26 Hz
Resonance
0.7
Q factor
87 dB
Sensitivity
± 22 mm
Linear excursion
2000 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
86.8
dB
Frequency response
19 - 500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
26.2
Hz
Mechanical quality factor
QMS
4.05
Electrical quality factor
QES
0.85
Total quality factor
QTS
0.70
Large signal parameters
Maximum linear excursion
xmax
22.0
mm
Air volume displaced at xmax
VD
2682
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W
Voice Coil
Nominal impedance
Z
2 x 2
Ω
DC resistance (in series)
RE
4.3
Ω
Inductance (1kHz, in series)
LE
1.5
mH
VC Diameter
75
mm
Magnet
Force factor (in series)
Bl
21.1
N/A
Motor constant
Bl/√RE
10.2
N/√W
Diaphragm
Effective diameter
394
mm
Effective area
SD
1219
cm²
Moving mass
MMS
532
g
Moving mass (without air load)
MMD
502.4
g
Suspensions
Stiffness
KMS
14.29
N/mm
Compliance
CMS
70
µm/N
Equivalent volume to the compliance
VAS
145
L
Mechanical resistance
RMS
21.62
N·s/m
Dimensions
Nominal diameter
18
″
462
mm
Overall diameter
462
mm
Baffle cutout diameter
426
mm
Overall depth
248
mm
Volume occupied by the driver (estimated)
8.5
L
Frame material
Cast Aluminium
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fS
26 Hz
SD
810 cm²
QTS
0.76
xmax
34.0 mm
SPL1W
86 dB
Bl/√RE
7.91
Pmax
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15″Subwoofer
fS
26 Hz
SD
810 cm²
QTS
0.76
xmax
34.0 mm
SPL1W
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Bl/√RE
7.9
Pmax
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18″Subwoofer
fS
25 Hz
SD
1210 cm²
QTS
0.55
xmax
33.0 mm
SPL1W
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Bl/√RE
12
Pmax
7000 W